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Phosphorylation of stathmin modulates its function as a microtubule depolymerizing factor

F J Moreno1, J Avila

  • 1Centro de Biología Molecular Severo Ochoa, CSIC-UAM, Cantoblanco, Madrid, Spain.

Molecular and Cellular Biochemistry
|July 9, 1998
PubMed
Summary
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Stathmin (oncoprotein 18) phosphorylation by specific kinases impacts its microtubule depolymerizing activity. Unphosphorylated stathmin exhibits higher activity than when phosphorylated by certain kinases, while others slightly increase it.

Area of Science:

  • Biochemistry
  • Cell Biology

Background:

  • Stathmin, also known as oncoprotein 18, is a key regulator of microtubule dynamics.
  • Its function as a microtubule depolymerizing factor is crucial for cellular processes.
  • Phosphorylation is a known post-translational modification that can alter stathmin's activity.

Purpose of the Study:

  • To investigate the effect of phosphorylation on stathmin's microtubule depolymerizing activity.
  • To identify specific protein kinases that modify stathmin and analyze the impact on its function.

Main Methods:

  • Isolation and characterization of bovine brain stathmin.
  • In vitro phosphorylation of stathmin using five different protein kinases: protein kinase A, MAP kinase, cdc2 kinase, glycogen synthase kinase 3, and casein kinase 2.
  • Assessment of microtubule depolymerizing activity of phosphorylated and unphosphorylated stathmin.

Related Experiment Videos

Main Results:

  • Phosphorylation sites on stathmin by different kinases were identified, with some corresponding to in vivo modifications.
  • Recombinant unphosphorylated stathmin and dephosphorylated native stathmin displayed similar, high microtubule depolymerizing activity.
  • Phosphorylation by protein kinase A, MAP kinase, or cdc2 kinase reduced stathmin's depolymerizing activity.
  • Phosphorylation by casein kinase 2 or glycogen synthase kinase 3 slightly increased the depolymerizing activity.

Conclusions:

  • The phosphorylation status of stathmin significantly modulates its microtubule depolymerizing activity.
  • Specific kinases have distinct effects on stathmin function, highlighting a complex regulatory mechanism.
  • These findings contribute to understanding the role of stathmin in microtubule dynamics and cellular regulation.